Through October 16, 2015 or while supplies last, you can get $20 off your online order of $70 or more at Staples.com when you pay with Visa Checkout. This offer is valid online only and not in store, with a limit of one coupon per customer. In addition, quite a few items are excluded from this promotion.

Full terms are as follows:

*Limited-time offer. Valid online at staples.com® when you pay with Visa Checkout only. Not valid in store. Limit one coupon per customer, nontransferable. Minimum purchase requirement of $70. Tax and shipping not included in calculating the minimum purchase. No cash/credit back. Not valid on SKU 513096, any AppleCare® Protection Plans, Beats™, Bose®, Canon® ink, Epson® ink and toner, HP ink and toner, JBL®, Roku®, SquareTrade® warranties, Staples Industrialsm purchases, Steelcase®, custom printing orders placed online, services, promotional products, gift cards, prior purchases or any purchases on other provider websites. Expires 10/16/15 or when promotional redemption limit has been reached.

For more info, see this link.